Masters of the secret, the Kings of England lord it over France, humble her, dismember her, have themselves crowned at Paris. They lose the secret; and the rout begins.
Masters of the secret, the Kings of France push back and overstep the narrow limits of their dominion, gradually founding a great nation and radiating with glory and power. They forget it or know not how to use it; and death, exile, ruin follow.
An invisible kingdom, in mid-water and at ten fathoms from land! An unknown fortress, taller than the towers of Notre Dame and built upon a granite foundation larger than a public square! What strength and what security! From Paris to the sea, by the Seine. There, the Havre, the new town, the necessary town. And, sixteen miles thence, the Hollow Needle, the impregnable sanctuary!
It is a sanctuary and also a stupendous hiding-place. All the treasures of the kings, increasing from century to century, all the gold of France, all that they extort from the people, all that they snatch from the clergy, all the booty gathered on the battle-fields of Europe lie heaped up in the royal cave. Old Merovingian gold sous, glittering crown-pieces, doubloons, ducats, florins, guineas; and the precious stones and the diamonds; and all the jewels and all the ornaments: everything is there. Who could discover it? Who could ever learn the impenetrable secret of the Needle? Nobody.
And Lupin becomes that sort of really disproportionate being whom we know, that miracle incapable of explanation so long as the truth remains in the shadow. Infinite though the resources of his genius be, they cannot suffice for the mad struggle which he maintains against society. He needs other, more material resources. He needs a sure place of retreat, he needs the certainty of impunity, the peace that allows of the execution of his plans.
Without the Hollow Needle, Lupin is incomprehensible, a myth, a character in a novel, having no connection with reality.
Master of the secret—and of such a secret!—he becomes simply a man like another, but gifted with the power of wielding in a superior manner the extraordinary weapon with which destiny has endowed him.
So the Needle was hollow.
It remained to discover how one obtained access to it.
From the sea, obviously. There must be, on the side of the offing, some fissure where boats could land at certain hours of the tide.